861 results about "Carbon substrate" patented technology

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer; the positive pole film layer comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the negative pole film layer comprises a carbon-based material; the electrolyte comprises a carboxylic ester solvent, a first additive and fluorine-containing lithium sulfimide, and the mass content of the carboxylic ester solvent is 8%-60%; the total mass content of the first additive is 2.5%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; the mass content of the fluorine-containing lithium sulfimide is 4%-8%. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved. # imgabs0 # formula A

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrolyte, a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole current collecting part and a positive pole film layer located on at least one surface of the positive pole current collecting part and containing a positive pole active material, and the positive pole active material comprises lithium-containing phosphate of an olivine structure; the coating weight of one side of the positive electrode film layer is 200mg / 1540.25 mm < 2 > to 370mg / 1540.25 mm < 2 >, the negative electrode plate comprises a negative electrode current collecting part and a negative electrode film layer which is positioned on at least one surface of the negative electrode current collecting part and contains a negative electrode active material, the negative electrode active material comprises a carbon-based material, the conductivity of the electrolyte is 13-20mS / cm, the battery monomer is subjected to constant-current discharge from a 100% state of charge (0.33 C) to 2.0 V at 25 DEG C, and a discharge platform voltage V1 is 3.19-3.235 V. According to the invention, the fast charging performance, the energy density and the cycle performance of the battery monomer can be improved.

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The application provides a cement-based zinc ion hybrid capacitor, a preparation method thereof and application of the capacitor in an energy storage device. The cement-based zinc ion hybrid capacitor comprises an active carbon positive electrode, a zinc foil negative electrode and a composite air-entraining mortar interlayer arranged between the two electrodes. The active carbon positive electrode is active carbon loaded on a carrier with good conductivity, and the carrier is any one of carbon-based materials such as carbon felt, carbon fiber and graphite plate or any one of foils, meshes and foams of metals such as stainless steel, copper, titanium and nickel and alloys thereof. The composite air-entraining mortar interlayer between the two electrodes is immersed in an electrolyte under negative pressure. The composite air-entraining mortar has interconnected pores, and ions are transmitted through the electrolyte in the pores and participate in electrode reactions. The application mainly provides a porous cement-based solid electrolyte based on a composite air-entraining technology and a structural electrochemical energy storage device, and the structural energy storage device can simultaneously have good energy storage characteristics and mechanical properties.

The utility model discloses a gas distribution device for graphite powder, and belongs to the field of carbon-based material production equipment. The technical problem that when high-temperature purification equipment purifies graphite powder, the purity of the graphite powder is not high is solved. According to the technical scheme, the gas distribution device comprises a gas distribution device body, one end face of the gas distribution device body is provided with a plurality of gas channels, the gas channels are distributed in a radial mode, each gas channel is provided with a plurality of first gas holes, the first gas holes in each gas channel are linearly distributed, and second gas holes are formed in the positions, communicated with the gas channels, of the gas distribution device body. The first air holes and the second air holes are linearly arranged, a plurality of positioning grooves are formed in the other end face of the air distribution device body, the positioning grooves are used for containing object carrying devices, ventilation pipelines on the object carrying devices correspond to and communicate with the first air holes in a one-to-one mode, and ventilation pipelines correspond to and communicate with the second air holes in a one-to-one mode; the utility model is applied to high-temperature purification equipment.

The invention discloses an electromagnetic shielding method for a high-density integrated wireless audio module, and the method comprises the steps: employing a metal material with good conductivity and corrosion resistance, such as aluminum alloy and copper alloy, to cover the outer surface of the module, and enabling the outer metal shielding layer to be used for isolating external electromagnetic interference; the thickness of the outer metal shielding layer is generally 0.3 mm to 1 mm, it is ensured that external electromagnetic radiation can be effectively reflected or absorbed, and the outer metal shielding layer is located between the outer metal shielding layer and the inner conductive coating and is made of a material with high-frequency absorption performance, such as a ferrite material, a conductive polymer or a carbon-based material. The thickness of the wave-absorbing layer can be designed according to the electromagnetic characteristics of a working frequency band and is generally 0.5 mm to 2 mm, so that high-frequency noise can be effectively attenuated. By adopting a multi-layer shielding structure and an intelligent heat dissipation design, electromagnetic interference is effectively reduced, miniaturization and light weight of the wireless audio module are maintained, and compared with the prior art in which a large number of expensive shielding materials are needed, the wireless audio module has the advantages that the selection of the shielding materials and the intelligent heat dissipation design are optimized.

The invention provides a preparation method of an ultrahigh-temperature oxidation ablation resistant tantalum-based ceramic and silicon carbide composite thermal protection coating, which comprises the following steps: (1) mixing a polymer binder and a solvent to form a solution, and carrying out ball-milling mixing on the solution, a tantalum-containing compound, silicon carbide, silicon and other components to prepare precursor slurry; (2) uniformly coating the surface of a carbon substrate with the slurry obtained in the step (1) by a dip-coating method, and drying; (3) realizing curing and pyrolysis of the coating through segmented heat treatment; and (4) the coating is subjected to vacuum siliconizing treatment, and the composite thermal protection coating is obtained. According to the tantalum-based ceramic and silicon carbide composite thermal protection coating prepared through the method, the ultrahigh-temperature oxidation resistance, ablation resistance, thermal shock resistance and heat insulation performance of the coating are remarkably improved. After the coating is ablated for 2400s under oxyacetylene flame at the temperature of 1650 DEG C, the integrity and excellent thermal protection effect of the coating can still be kept.

Disclosed herein is a current collector, a secondary battery, an electrical device, and a method for preparing the current collector. The current collector includes a substrate. The substrate includes the porous material. The affinity material is disposed in pores of the porous material. The affinity material is configured to promote the deposition of metal ions in an electrolyte solution. The affinity material includes at least one of a carbon-based material, a non-metal oxide, a carbide, a fluoride, a nitride, a sulfide, a phosphide, and an organic material. The above manner is able to effectively reduce the nucleation overpotential of the metal ions on the porous material of the current collector, promote the uniform diffusion and deposition of the metal ions within the pores of the porous material of the current collector, inhibit the generation of a dendrite, and improve the cyclic performance and safety of the battery.

The invention provides a secondary battery and an electric device. The secondary battery comprises a negative electrode piece, the negative electrode piece comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, the negative electrode active material comprises a first carbon-based material and a second carbon-based material, the first carbon-based material and the second carbon-based material both have pore structures, the ID / IG of the first carbon-based material is less than or equal to 0.27, the ID / IG of the second carbon-based material is greater than or equal to 0.38, ID represents the D peak intensity of a Raman spectrum at 1350 + / -50 cm <-1 >, and IG represents the G peak intensity of the Raman spectrum at 1580 + / -50 cm <-1 >. The secondary battery has improved low temperature dynamic performance and high temperature storage performance.

The invention discloses a method for preparing an ultrahigh-temperature ceramic coating by an ultrahigh-temperature metal gas source based on a molten salt medium, which comprises the following steps of: mixing low-melting-point salt A, metal fluoride and metal M to obtain a mixture C, putting the mixture C into a first crucible, mixing low-melting-point salt B and metal M to obtain a mixture D, putting the mixture D into a second crucible, putting a carbon base material into a deposition furnace, and performing vacuum drying to obtain the ultrahigh-temperature ceramic coating. Heating the first crucible to melt the mixture C to obtain a melt E, and heating the second crucible to melt the mixture D to obtain a melt F; carrier gas is guided into the first crucible, the carrier gas flow passes through the melt E to form gas flow containing a metal gas source, the gas flow containing the metal gas source is guided into the second crucible, and the gas flow containing the metal gas source is filtered by the melt F in the second crucible to form a pure metal reaction gas source, and finally, a pure metal reaction gas source is introduced into the deposition furnace for deposition of the carbon base material, and the ultra-high-temperature ceramic coating is obtained. The method is easy to operate and low in cost.

The invention provides a composite photo-thermal hydrogel for seawater desalination and a preparation method and application thereof, the hydrogel has a structural unit of a structure as shown in a formula I. COF with photo-thermal performance is compounded with the hydrogel, and the hydrogel has a three-dimensional long-range ordered pore structure to promote transmission of water molecules; and the COF dispersed in the material contains porphyrin and a C = N double-bond connection structure, so that the material has excellent photothermal conversion efficiency. Therefore, under the irradiation of sunlight, the composite photo-thermal hydrogel disclosed by the invention can realize photo-thermal conversion to realize seawater evaporation, the seawater evaporation rate reaches 3.6 kgm <-1 > h <-1 >, and the performance is improved by about 3 times compared with that of a traditional carbon-based material. According to the preparation method of the composite photo-thermal hydrogel, large and complex equipment is not involved in the preparation method, the preparation technological process is simple, and industrial large-scale production is facilitated; and the reaction temperature in the preparation process is low, the energy consumption is also reduced, and the cost advantage is remarkable.

The invention provides a preparation method of an iron and nitrogen co-doped biomass-based carbon material, which can be applied to the technical fields of environmental functional materials and advanced oxidation. The preparation method comprises the following steps: obtaining target charcoal precursor powder; mixing the charcoal precursor powder with soluble ferric salt and urea to form initial mixed powder, adding water into the initial powder, and drying after water bath to obtain mixed powder; and heating and calcining the mixed powder according to preset process parameters to obtain the iron and nitrogen co-doped biomass-based carbon material. The prepared iron and nitrogen co-doped biomass-based carbon material FeOx has a high specific surface area and a rich pore structure, FeOx is uniformly dispersed on a nitrogen-doped carbon substrate, ozone catalytic activity and electron conduction performance are improved, and reactive oxygen species (ROS) can be efficiently generated to degrade sulfamethoxazole.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a negative pole piece, a positive pole piece and an electrolyte, the battery monomer comprises a negative current collector and a negative film layer arranged on at least one side of the negative current collector, the negative film layer comprises a negative active material, and the negative active material comprises a carbon-based material; the positive pole piece comprises a positive pole current collector and a positive pole film layer arranged on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole active material and a positive pole additive, and the positive pole active material comprises the positive pole additive which comprises at least one of lithium-containing iron oxide and lithium-containing cobalt oxide; the electrolyte comprises an organic solvent, the organic solvent comprises a carboxylic ester solvent, and the mass content of the carboxylic ester solvent in the electrolyte is 3%-70%. The high-temperature cycle performance of the battery monomer can be further improved.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a negative pole piece and an electrolyte, the negative pole piece comprises a negative current collector and a negative film layer arranged on at least one side of the negative current collector, the negative film layer comprises a negative active material, the negative active material comprises a silicon-based material and a carbon-based material, and the silicon-based material and the carbon-based material are arranged on the negative current collector. The mass content of the silicon element of the silicon-based material in the negative electrode active material is 0.3%-15%, and the single-side coating weight of the negative electrode film layer is 80 mg / 1540.25 mm < 2 >-150 mg / 1540.25 mm < 2 >; the electrolyte comprises an organic solvent, the organic solvent comprises a carboxylic ester solvent, and the mass content of the carboxylic ester solvent in the electrolyte is 3%-70%. The high-temperature storage performance and the cycle performance of the battery monomer can be further improved.

The invention discloses a surface oxidation monatomic nano-alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of advanced nano-energy materials and electro-catalysis. A surface-oxidized monatomic nano-alloy catalyst comprises a hydroxylated carbon nanotube carrier and bimetallic nano-alloy particles loaded on the hydroxylated carbon nanotube carrier, in the bimetallic nano-alloy particles, non-noble metal elements are dispersed in noble metal nano-particles in a monatomic form, the size of the bimetallic nano-alloy particles is 3-4 nm, and the surface-oxidized monatomic nano-alloy catalyst is prepared from a surface-oxidized monatomic nano-alloy catalyst. An oxide layer with the thickness of 0.3-0.6 nm is arranged on the surface of the bimetallic nano-alloy particle; the loading amount of the noble metal is 5-15wt%. Ruthenium and other non-noble metal elements are alloyed and anchored on the carbon material substrate, the conductivity of the catalyst can be greatly improved, the size of alloy particles is accurately controlled within the range of 3-4 nm, active sites can be exposed to the maximum extent, and structural stability is considered.

The invention relates to a flow battery carbon-based electrode and a preparation method and application thereof, and the preparation method comprises the following steps: respectively dissolving cobalt salt and alkali in a polar organic solvent, and uniformly mixing to form a precursor solution; placing a carbon-based material in the precursor solution, and carrying out a hydrothermal reaction to obtain a carbon-based electrode precursor; and performing high-temperature carbonization on the carbon-based electrode precursor in an inert atmosphere, cooling to room temperature after the reaction is completed, and then cleaning and removing impurities from a product to obtain the carbon-based electrode, the polar organic solvent is at least one of formamide, acetonitrile and N, N-dimethylformamide; after cobalt cyanide is deposited on the surface of the carbon-based material, surface etching and nitrogen doping are carried out on the carbon-based material under the high-temperature condition, surface modification of the carbon-based material is achieved, the contact area of the surface of the carbon-based electrode and electrolyte is increased, and the electrochemical performance of the carbon-based electrode is improved.

The invention provides a polyurethane composite material and application thereof, and relates to the technical field of polyurethane materials. The polyurethane composite material consists of a component A and a component B, the component A comprises the following raw material components in parts by weight: 100 parts of polymer dihydric alcohol, 1-8 parts of a chain extender, 1-3 parts of a catalyst, 0-5 parts of a cross-linking agent, 0.1-2 parts of a carbon-based material, 1-10 parts of an anthraquinone compound and 0.5-2 parts of water; and the component B is an isocyanate curing agent and comprises a prepolymer with a plurality of ester bonds and urea bonds. The polyurethane composite material disclosed by the invention has relatively high mechanical strength, wear resistance and the like, and is suitable for treating nitrogen-containing sewage.

The invention discloses a silicon-carbon negative electrode material of a lithium ion battery as well as a preparation method and application of the silicon-carbon negative electrode material. The silicon-carbon negative electrode material of the lithium ion battery consists of a core structure and a coating layer structure, the inner core structure is selected from one of a carbon base material or a silicon base material; the coating layer structure is formed by coating a carbon coating layer, a silicon coating layer and a carbon-silicon composite layer at intervals; the carbon coating layers are isolated by the silicon coating layers or the carbon-silicon composite layers, the silicon coating layers are isolated by the carbon coating layers or the carbon-silicon composite layers, and the carbon-silicon composite layers are isolated by the carbon coating layers or the silicon coating layers. Compared with the existing silicon-carbon negative electrode material, the silicon-carbon negative electrode material of the lithium ion battery provided by the invention has more stable structural design and smaller particle size, and has higher specific capacity while achieving good cycling stability. The material can be widely applied to the field of negative electrode materials of lithium ion batteries.

The invention discloses a carbon-silicon negative electrode material, a preparation method thereof and a battery, and belongs to the technical field of carbon-silicon materials. The silicon content in the negative electrode material is 40-70wt%, the specific surface area is less than or equal to 3m < 2 > / g, the micropore volume is less than or equal to 0.001 m < 3 > / g, and the average grain size of silicon grains is less than or equal to 2nm; in a dQ / dV-V curve, h1 / h2 is greater than or equal to 1.5, and h1 and h2 are respectively lithium removal oxidation peak intensities corresponding to 0.28-0.32 V and 0.44-0.48 V. The preparation method comprises the following steps: carrying out surface passivation treatment on a precursor obtained by carrying out nanometer silicon vapor deposition on a carbon base material, and carrying out carbon coating in a rotary kiln, the method is simple, and the obtained negative electrode material has a double-layer coating structure, a relatively low specific surface area and relatively high mechanical strength, and is suitable for large-scale production. And the rapid volume expansion of the buffer silicon nanoparticles in the repeated lithiation / lithium removal process is facilitated, so that the negative electrode material has relatively high capacity and cycle performance.

A ceramic component included in a plasma etching apparatus, wherein a surface of the ceramic component may include a base material and a composite material disposed in contact with the base material, wherein a resistivity of the ceramic component may be 10−1 Ω·cm to 20 Ω·cm, and wherein the base material may include a first boron carbide-based material and the composite material may include at least one selected from the group consisting of a second boron carbide-based material, a carbon-based material, and combinations thereof, is disclosed.

The invention discloses an electrocatalyst for biomass conversion and plastic degradation as well as a preparation method and application of the electrocatalyst. According to the catalyst, a carbon-based material serves as a catalyst carrier, multi-component metal and multi-component metal oxide are loaded to prepare the catalyst of a binary metal interface structure, and the catalyst is recorded as NM / TMOx / C, NM is one or more of precious metal Au, Ag, Ir, In, Pd, Pt, Ru and Rh, TM is one or more of transition metal Co, Cu, Mn, Ni, Fe and Ti, the loading amount of NM is 0.5 wt%-35 wt%, and the loading amount of TM is 1 wt%-30 wt%; the invention also provides a preparation method and an application method of the catalyst. The catalyst NM / TMO / C is high in reaction rate of electrocatalytic oxidation of biomass and plastic degradation under low potential, high in selectivity of corresponding multi-electron products, good in CO toxicity resistance, good in stability and high in repeatability.

The application provides a preparation method of a self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon composite material, a product and application, high-content nitrogen-doped porous carbon material is synthesized by inducing dicyandiamide molecules to undergo a supramolecular self-assembly process, and on this basis, a hydrothermal reaction is carried out to coat molybdenum sulfide sheet layer material on the surface, and finally, a self-heating coiling treatment is carried out to form a carbon-based electrocatalyst of the self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon. Compared with a high specific surface area carbon-based catalyst, high doping concentration of nitrogen atoms can provide more electron-rich properties to facilitate the adsorption of substances, and the self-coiled carbon-based material can exhibit very excellent electrochemical performance, especially in the aspect of electrochemical hydrogen production. The preparation method is simple in operation, low in preparation cost and suitable for large-scale production.

This all-solid-state secondary battery comprises a cathode layer, an anode layer, and a solid electrolyte layer between the cathode layer and the anode layer. The cathode layer includes a cathode current collector and a cathode active material layer on one surface of the cathode current collector. The anode layer includes an anode current collector and a first anode active material layer on one surface of the anode current collector. The first anode active material layer includes a first anode active material, a second anode active material and a carbon-based material, and the first anode active material includes an alloy phase.

Battery cell, including: a case; and an electrode assembly located inside the housing, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator film, the separator film being arranged between the positive and the negative electrode plates, where The negative electrode plate comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector. The negative electrode film layer comprises an active material of the negative electrode. The negative electrode film layer comprises a first negative electrode film layer located away from the negative electrode current collector and a second negative electrode film layer located near the negative electrode current collector. The first negative electrode film layer comprises a first active material of the negative electrode, and the second negative electrode film layer comprises a second active material of the negative electrode.The first active material of the negative electrode contains a silicon-based material and a carbon-based material, the second active material of the negative electrode contains a carbon-based material, and the mass fraction of the silicon element in the negative electrode film layer is 0.5% to 6%. The separator film comprises a base film, a first porous coating on the side of the base film facing the negative electrode plate, and a second porous coating on the side of the base film facing the positive electrode plate. Both the first and second porous coatings contain filler particles.

The invention provides a black insulating polyimide material and a preparation method thereof, and particularly provides a polyamide acid solution which comprises a diamine monomer, a dianhydride monomer and a simple substance phosphorus-containing mixture, and the simple substance phosphorus-containing mixture is a mixture obtained by ball-milling simple substance phosphorus and boron nitride or porous silicon and a solvent. The black insulating polyimide material can be prepared from the polyamide acid solution, the influence of a carbon-based material on the insulating property of the polyimide material is avoided due to the adoption of the mixture containing the elemental phosphorus, and the elemental phosphorus material does not need to be added with a plasticizer and other materials. More importantly, the simple substance phosphorus and the boron nitride or the porous silicon can enable the polyimide to be black, meanwhile, the insulating property of the polyimide is improved, the heat-conducting property is improved, and the comprehensive performance of the black polyimide material is remarkably improved.

The invention relates to the field of energy storage batteries, in particular to a surface modification method of a carbon-based negative electrode material for a lithium ion battery and the carbon-based negative electrode material.The surface modification method comprises the following steps that S1, the carbon-based material, soluble saccharides, a lithium source and a solvent are mixed; s2, carrying out ball milling treatment on the slurry to obtain a precursor mixture; s3, calcining the precursor mixture to obtain a primary modified carbon material; s4, treating the primary modified carbon material in ozone to obtain an oxidation modified carbon material; and S5, dispersing the oxidation modified carbon material in a solution containing a conductive monomer and an oxidizing agent for chemical polymerization reaction, and depositing on the surface of the carbon material to form a polymer coating layer, thereby obtaining the surface modified carbon-based negative electrode material. By constructing a pre-lithiated carbon coated inner core and an ozone activation interface and preparing a modification layer of a conductive polymer, the core problems that a traditional carbon negative electrode is low in first efficiency, short in cycle life and poor in rate capability and is difficult to consider at the same time are solved.

The invention relates to the technical field of artware processing, in particular to an intelligent regulation and control system and method for carbon carving cinnabar painting, and the system comprises a pretreatment module, a spraying module, a detection module and a control module. The pretreatment module is used for sequentially carrying out sand blasting, cleaning and drying treatment on the target drawing surface of the carbon plate; the spraying module completes spraying according to preset parameters; the detection module obtains a spraying surface image and a bonding strength parameter; the control module judges whether the spraying of the carbon plate meets the standard or not according to the brightness characteristic value of the pre-spraying area, and additionally judges on the basis of the curing duration difference value; and if not, determining the reason that the spraying of the carbon plate does not meet the standard according to the mean value of the bonding strength. According to the intelligent regulation and control system, the problem that color difference exists when cinnabar is sprayed on the surface of a carbon carving product due to orientation of a carbon base material is solved, and the painting effect of spraying is improved.

A negative electrode sheet, a battery, and an electrical device. The negative electrode sheet comprises a current collector and a negative active material layer arranged on at least one surface of the current collector; the negative active material layer comprises an active material and conductive carbon black; the active material comprises a carbon-based material; the conductive carbon black satisfies equation (I).

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive pole current collecting part and a positive pole film layer, and the positive pole film layer comprises lithium-containing phosphate; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the single-side coating weight of the negative pole film layer is 80 mg / 1540.25 mm < 2 > to 135 mg / 1540.25 mm < 2 >; the negative electrode film layer comprises a carbon-based material and a silicon-based material, and the mass content of the silicon element of the silicon-based material in the negative electrode film layer is 0.3-6%; the electrolyte comprises a chain carboxylic ester solvent and an additive, the mass content of the chain carboxylic ester solvent in the electrolyte is 5%-35%, the additive comprises one or more of a carbonic ester additive, a sulfur-containing additive and a lithium salt additive, and the mass content of the additive in the electrolyte is 0.5%-10%. The rapid charging capability and the cycle performance of the battery monomer can be further improved.

The application provides a secondary battery and an electric device, the secondary battery comprising a negative electrode sheet, the negative electrode sheet comprising a negative electrode current collector and a negative electrode film layer on at least one surface of the negative electrode current collector, the negative electrode film layer comprising a negative electrode active material, the negative electrode active material comprising a first carbon-based material and a second carbon-based material, the first carbon-based material comprising artificial graphite secondary particles, the second carbon-based material comprising an outer region and an inner region inside the outer region, the outer region being a region extending from the surface of the particles of the second carbon-based material to the interior of the particles by a distance of 2.5 μm, in a cross-sectional view of the second carbon-based material, the total pore area of the outer region being denoted as S1, the total pore area of the inner region being denoted as S2, and S2>S1. The application can improve the cycle performance of the secondary battery.